He______ unwisely, but he was at least trying to do something helpful. （1999年考试真

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问题 He______ unwisely, but he was at least trying to do something helpful. （1999年考试真题）

选项 A、may have acted
B、must have acted
C、should act
D、would act

答案 A

解析本题考点为情态动词may+have done，表示对过去某种情况的推测。

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